Mac mini m2 pro fan periodically spins loudly for no discernable reason
As you can see from the attached pic, temps are all quite low (ºC) for modern semiconductors -- and yet the fan is spinning at >4000rpm.
This occurs around once a month and lasts for 5-10 minutes.
Others seem to see similar things according to this thread: https://forums.macrumors.com/threads/so-how-silent-is-the-m2-pro-mac-mini.2378290/page-19